Answer:

Answer:
To file a building permit application for a new fence in Marin County, use the Marin County Community Development Agency – Building & Safety Division’s online portal at cdaportal2.marincounty.org/MarinBuildingPermits.

• Key points:
• When a permit is needed: Fences over 7 feet require a building permit. Fences 7 feet or less are exempt from a building permit under 2025 CRC R105.2, but county zoning still regulates height (typically 4 ft front yard, 6 ft rear/side) and setbacks.
• Two permit tracks: Marin County offers (1) quick online permits for maintenance/minor improvements (no plans required) and (2) larger projects that require upfront plan review (6–8 weeks). A new fence over 7 ft typically falls into the latter track.
• How to apply:
• 1. Confirm your project needs a permit (use the county’s portal or call (415) 473‑6550).
• 2. Prepare a site plan and construction drawings.
• 3. Submit the application online at the portal above.
• 4. Pay the applicable fees (fees are based on estimated project value; contact the department for the current schedule).
• 5. Wait for review (typical fence permit approval is about 2 weeks).
• 6. Post the approved permit on site and schedule required inspections (post‑hole/footing and final).
• Contact: Building & Safety Division, 3501 Civic Center Dr, Suite 308, San Rafael, CA 94903; phone (415) 473‑6550; hours Mon–Thu 8 am–4 pm, Fri 8 am–12 pm.

Facts recorded from official sources:

1. Marin County has two building permit processes: quick online permits for maintenance/minor improvements (no plans needed), and larger projects requiring upfront plan review (6–8 weeks). — Marin County Building & Safety “How to apply” page
2. Fences over 7 feet require a building permit in Marin County; fences 7 feet or less are exempt from building permit under 2025 CRC R105.2, but county zoning regulates height (typically 4 ft front yard, 6 ft rear/side) and setbacks. — PermitMint guide citing Marin County CDA

What I could not find:
The exact current fee schedule for a fence permit (the county site says fees are based on estimated project value and to contact the department for the latest figures).